linux-kernel - [PATCH v1] crypto: caam - set hwrng quality level

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Date:   Wed, 19 Jul 2017 09:44:58 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     kernel@...gutronix.de,
        Horia Geantă <horia.geanta@....com>,
        Dan Douglass <dan.douglass@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>
Subject: [PATCH v1] crypto: caam - set hwrng quality level

According documentation, it is NIST certified TRNG.
So, set high quality to let the HWRNG framework automatically use it.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/crypto/caam/caamrng.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 41398da3edf4..684c0bc88dfd 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -292,10 +292,16 @@ static int caam_init_rng(struct caam_rng_ctx *ctx, struct device *jrdev)
 	return 0;
 }
 
+/*
+ * hwrng register struct
+ * The trng is suppost to have 100% entropy, and thus
+ * we register with a very high quality value.
+ */
 static struct hwrng caam_rng = {
 	.name		= "rng-caam",
 	.cleanup	= caam_cleanup,
 	.read		= caam_read,
+	.quality	= 999,
 };
 
 static void __exit caam_rng_exit(void)
-- 
2.11.0